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Laptop test for MODBUS/RS-485 probe

Posted on 2013/11/05 by andy

Laptop test for MODBUS/RS-485 probe Continue reading →

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mega128-sram-test

Posted on 2014/05/23 by andy

Test board for external SRAM Continue reading →

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WebPD opened editors limit modification

Posted on 2018/11/13 by andy

IDE environment in IBM BPM migrated from Eclipse-based app to WebPD, a web-based process editor. WebPD built on top of IBM BPM Coach Framework, based on dojo toolkit, hosting complex visual editors suffers from performance and stability issues. It can simply reload itself mid your work (because of some internal broken assertion), editor can stuck and manual reload is needed etc. The more artifacts opened the less stable it is. To limit resource… Continue reading →

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Pimp my bus: from 8-bit AVR to 32-bit ARM

Posted on 2015/04/13 by andy

Going to newer architecture is unevitable evolution. ARM series is particularly good choice as knowledge of its core functionality is to large extent portable across manufacturers. While ARM Cortex-M chips are close to 8-bit AVRs in footprint size and price tag, they give more processing power and peripherals. More complex architecture and ultra-small packaging is often counter-argument on hobbyists forums. Does it really matter? Here is my… Continue reading →

Posted in Electronics, Software | Tagged , | 3 Comments

3D printing at home

Posted on 2014/08/01 by andy

These days turning imagination into reality at home is more real than ever. RepRap movement made fused deposition modeling technology affordable. Turning a figurine or mathematical object into physical object is exciting and funny and using 3D printer to fabricate mechanical constructions or replacement parts makes it another tool on a workbench. Yet 3D printing is far away from “Ctrl+P… ready” approach. Let me share the… Continue reading →

Posted in 3D printer, Electronics, Gadgets | 4 Comments

sk8-half-open

Posted on 2011/04/10 by andy

Half-opened bearing; less friction and easier maintenance Continue reading →

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EMI shielding

Posted on 2015/09/01 by andy

Close GSM antenna proximity to bare PCB was troublesome latching microSD. Using most resilient flash cards nearly solved the problem. Extra shielding would help to prepare for worst field conditions like area of weakest GSM signal leading to highest emission and EMI. I took long and tough lesson to get shielding done right. Initially I tried to isolate L-shaped PCBs from antenna with L-shaped aluminum foil sheet in between. Running system in… Continue reading →

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shield-v1-test

Posted on 2015/08/31 by andy

First shielding tests failed Continue reading →

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rainbow-pingpong-test-run

Posted on 2012/04/09 by andy
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rainbow-pingpong-test-run

Posted on 2012/04/07 by andy

Device in action (movie) Continue reading →

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